# Operational Amplifiers Guide vs NSV Airflo

The clearest difference is ads: NSV Airflo at none against Operational Amplifiers Guide's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Operational Amplifiers Guide ships an update every 2 months, NSV Airflo every 5 weeks. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Operational Amplifiers Guide | NSV Airflo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 17 MB | 3 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [NSV](https://appshunter.io/developer/1535918116) |

## What reviewers say

### Operational Amplifiers Guide

[App page](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### NSV Airflo

[App page](https://appshunter.io/ios/app/nsv-airflo/id6748596005)

**In-app purchases:** none


## Frequently asked questions

### Is Operational Amplifiers Guide free?

Operational Amplifiers Guide is free to download, with no in-app purchases.

### Is NSV Airflo free?

NSV Airflo is free to download, with no in-app purchases.

### Do Operational Amplifiers Guide or NSV Airflo have ads?

Operational Amplifiers Guide shows ads; NSV Airflo does not.

### Which is updated more often, Operational Amplifiers Guide or NSV Airflo?

Operational Amplifiers Guide ships an update every 2 months, and NSV Airflo every 5 weeks. Most recently, Operational Amplifiers Guide was updated on October 1, 2026 and NSV Airflo on October 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*